﻿23H i.i;rii)<)i)KS.M A 



cardinals, the anterior the lonj?er, and two short, curved lat- 

 erals, the lower much higher and reflexed upward, the upper 

 deflected downward ; riL^lil valve with one feeble pseudocardi- 

 nal and a strong, retlexed lateral ; beak cavities deep and wide ; 

 dorsal scars in a row under the anterior part of the hinge 

 I)late ; adductor scars shallow ; nacre dirt\' white, dull j)ur- 

 yiWsh behind, lusterless. 



Length 170, height 120, diam. 85 mm. 



Deep River, Kiang Nan, China. 

 Unio Injiiniilati ni.rni:. J. de Conch.. XXII, 1874. p 116; 



Conch. Fluv. Xank., I, 1875, pi. vii. 

 Lcpidodcsma lan<j,uilati Simi'.son, Pr. I'. S. Nat. Mus., XVIII, 



1896, p. 311. 

 Lepidodisma languilati Simpson, Syn., 1900, p. 587. 

 Cristaria megadcsnia von M.artens, S. B. Nat. Fr., 1875, p. 



3; Nov. Conch., IV, 1876, p. 152, pi. cxx.w. fig. i. 

 Barbala nici^adrsiiia P.irrEL, Conch. Sam., Ill, i8c)0, p. 175. 



A most remarkable and magnificent Naiad, whose relations 

 are a little in doubt, as nothing is known of its anatomy. The 

 beak sculpture resembles that of Anodonta gratulis in its earlier 

 stage and later that of some of the Cristarias. A young and 

 an adult shell are in the National Museum collection, from 

 the author. 



LKriDoniiSMA aijokk (Heude). 



Shell very large, irregularly triangular, inflated, with high 

 beaks, whose sculpture has not been observed, with a double 

 posterior ridge, the lower one very strong above, which ends 

 behind in a wide biangulation, the shell being rather s(|uarely 

 truncate posteriorly ; post-dorsal wing high, covered with scat- 

 tered nodules, which extend on to the posterior slope and are 

 often turned to one side ; anterior end rounded ; base line 

 straight or slightly incurved, rounded up a little behind ; sur- 

 face strongly sulcate throughout ; ligament partially covered 

 bv the wing; no measurements are given by Heude. His fig- 

 ure is 195 mm. in length and 157 in height. 



China. 



